Add WebKit brace style configuration option.

Summary:
Add brace style `BS_WebKit` as described on https://www.webkit.org/coding/coding-style.html:

* Function definitions: place each brace on its own line.
* Other braces: place the open brace on the line preceding the code block; place the close brace on its own line.

Set brace style used in `getWebKitStyle()` to the newly added `BS_WebKit`.

Reviewers: djasper, klimek

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D11837

llvm-svn: 244446
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 5c23906..55f9080 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -98,6 +98,7 @@
     IO.enumCase(Value, "Stroustrup", FormatStyle::BS_Stroustrup);
     IO.enumCase(Value, "Allman", FormatStyle::BS_Allman);
     IO.enumCase(Value, "GNU", FormatStyle::BS_GNU);
+    IO.enumCase(Value, "WebKit", FormatStyle::BS_WebKit);
   }
 };
 
@@ -504,7 +505,7 @@
   Style.AlignOperands = false;
   Style.AlignTrailingComments = false;
   Style.BreakBeforeBinaryOperators = FormatStyle::BOS_All;
-  Style.BreakBeforeBraces = FormatStyle::BS_Stroustrup;
+  Style.BreakBeforeBraces = FormatStyle::BS_WebKit;
   Style.BreakConstructorInitializersBeforeComma = true;
   Style.Cpp11BracedListStyle = false;
   Style.ColumnLimit = 0;